I didn't know about the modern kit versions, but the other clues all seem to point to the Fieseler Storch. The giveaway is the one about the .45's: In the last air combat of the war in Europe, two Americans in a Cub forced a Storch down by shooting at it with their .45 pistols.
Here's the Wikipedia page for the Storch:
https://en.wikipedia.org/wiki/Fieseler_Fi_156